https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88713
--- Comment #51 from rguenther at suse dot de <rguenther at suse dot de> --- On Thu, 24 Jan 2019, tkoenig at gcc dot gnu.org wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88713 > > --- Comment #49 from Thomas Koenig <tkoenig at gcc dot gnu.org> --- > (In reply to Uroš Bizjak from comment #48) > > (In reply to rguent...@suse.de from comment #47) > > > >But why don't we generate sqrtps for vector sqrtf? > > > > > > That's the default for - mrecip back in time we benchmarked it and scalar > > > recip miscompares sth. > > > > It was polyhedron benchmark, in one benchmark, the index was calculated from > > square root, and that was too sensitive for 2 ULP difference. > > Argh. Sacrificing performance for the sake of bugware... Maybe use of FMA can recover 1 ULP and the benchmark ;)
